I think this is invaluable:
FIT FOR PURPOSE?
A GUIDE TO COMPLETING THE ESA 50
http://www.nawra.org.uk/Documents/C... Purpose A Guide to Completing the ESA50.pdf
FIT FOR PURPOSE?
A GUIDE TO COMPLETING THE ESA 50
http://www.nawra.org.uk/Documents/C... Purpose A Guide to Completing the ESA50.pdf